1 ## Copyright (C) 1995-2012 Kurt Hornik
3 ## This file is part of Octave.
5 ## Octave is free software; you can redistribute it and/or modify it
6 ## under the terms of the GNU General Public License as published by
7 ## the Free Software Foundation; either version 3 of the License, or (at
8 ## your option) any later version.
10 ## Octave is distributed in the hope that it will be useful, but
11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 ## General Public License for more details.
15 ## You should have received a copy of the GNU General Public License
16 ## along with Octave; see the file COPYING. If not, see
17 ## <http://www.gnu.org/licenses/>.
20 ## @deftypefn {Function File} {} cloglog (@var{x})
21 ## Return the complementary log-log function of @var{x}, defined as
24 ## {\rm cloglog}(x) = - \log (- \log (x))
30 ## cloglog (x) = - log (- log (@var{x}))
36 ## Author: KH <Kurt.Hornik@wu-wien.ac.at>
37 ## Description: Complementary log-log function
39 function y = cloglog (x)
45 y = - log (- log (x));
49 %!assert(cloglog(0), -Inf)
50 %!assert(cloglog(1), Inf)
51 %!assert(cloglog(1/e), 0)
53 %% Test input validation
55 %!error cloglog (1, 2)